NOTA : The format is still changing with each new Draft version. Be careful to adapt your reading to the version your are using
IETF Officials Drafts
Format Official IETF draft : The Incident Detection Message Exchange Format version 2 (IDMEFv2)
- Official IETF repository: https://datatracker.ietf.org/doc/draft-lehmann-idmefv2/
Transport IETF official draft : Transport of Incident Detection Message Exchange Format version 2 (IDMEFv2) Messages over HTTPS
- Official IETF Repository : https://datatracker.ietf.org/doc/draft-poirotte-idmefv2-https-transport/